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    an electron of charge 1.6 x 10^-19C and mass 9.1 x 10^-31kg is accelerated by a potential difference of 3400V. it is then subjected to a magnetic field of flux density 0.056T.
    calculate:
    the speed of the electron
    the force it experiences when it enters the magnetic field

    thanks
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    itrs ok i got this one too - but im not tellin
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    (Original post by ryan750)
    an electron of charge 1.6 x 10^-19C and mass 9.1 x 10^-31kg is accelerated by a potential difference of 3400V. it is then subjected to a magnetic field of flux density 0.056T.
    calculate:
    the speed of the electron
    the force it experiences when it enters the magnetic field

    thanks
    Energy of the electron = 3400 x 1.6 x 10^-19 = 5.44 x 10^-16 J
    1/2 mv2 = 5.44 x 10^-16 J
    v = 34.6 x 10^6 ms-1

    F = Bev
    = 0.056 x 1.6 x 10^-19 x 34.6 x 10^6
    = 3.10 x 10^-13 N
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    loooks ok to me
 
 
 
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